Valence electrons that are not bound to the nucleus
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B
Inner orbit electrons that are not bound to the nucleus
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C
Valence electrons that are bound to the nucleus
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D
Valence electrons that are only on the metal surface
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Solution
The correct option is A
Valence electrons that are not bound to the nucleus
Free electrons are the valence electrons that are not bound to the nucleus and are free to move in a conductor. These free electrons make the metal a good conductor.